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ECM update?

G

Gen 4.6

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What does the ECM update do to the 4.6 v8? Took the car in for a Navi update and the brake switch recall...the service tech said I also needed an ECM update...why?
 
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They updated my ECM. I can tell no difference. Nav added a lot of streets and POI.
 
OK great thanks for the reply...was there any changes in the transmission shifts...more firm for example?
 
Gen 4.6 said:
OK great thanks for the reply...was there any changes in the transmission shifts...more firm for example?
Click to expand...

I had my ECM updated about three-four weeks ago and it seems that there is the difference in transmission shifts (quicker response).
 
I had the ECM done but cannot tell any difference. I just had to reset almost everything regarding radio/seating position/mirror position, steering wheel position/ but my stinkin' headrest still creeps up!!!!!!

Anybody else have an issue with the rising headrest??
 
Black genesis badges emblems letters lettering chrome delete
I also perceive the transmission as shifting more aggressively since the ECM has been reflashed. I experienced no problems after it was done.
 
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